One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,4,5)(3,7,8,6)(9,10)(11,14)(12,16)(13,15)(17,18,20,22)(19,21,23,24)(25,26,32,38)(27,35,28,34)(29,33,39,40)(30,37,31,36)(2,5)(6,7)(9,11,13,12)(10,14,15,16)(17,19,20,23)(18,21,22,24)(25,27,31,39,32,28,30,29)(26,33,37,34,38,40,36,35)(1,3)(2,6)(4,8)(5,7)(10,15)(14,16)(19,23)(21,24)(25,28,32,27)(26,34,38,35)(29,31,39,30)(33,36,40,37)(3,8)(6,7)(9,12,13,11)(10,16,15,14)(25,29,30,28,32,39,31,27)(26,35,36,40,38,34,37,33)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.